NR Massive MIMO Deep dive- Materials

5G Uplink HARQ Timing Explained | PUCCH/PUSCH ACK/NACK Mapping, K1 Delay & DCI Traces (Post + Video)

Introduction In 4G FDD, the uplink HARQ feedback timing was fixed. In 5G, this changes because of TDD operation and low-latency requirements. 5G introduces two methods for uplink HARQ feedback: * Flexible timing * Multiplexing timing This allows the network to optimize feedback delay depending on system configuration and UE capability. Flexible

5G HARQ Retransmission: Why Code Block Groups (CBG) Matter! (Post + Video)

💡 Why CBG Retransmission Matters? * It enables partial retransmissions of affected code blocks, reducing network load and improving spectral efficiency—especially important for large transport blocks in 5G. How it works? * As shown in the below picture, Large Transport Blocks (TBs) are segmented after CRC attachment to prevent exceeding the maximum

VoLTE E2E IMS SIP Registration | Call Flow & Message Breakdown

In this video, we explain IMS SIP registration with a step-by-step call flow and message details.

4G VoLTE Call Procedures: Attach, IMS, and Capability Checks

In this video, we explain VoLTE call procedures in 4G LTE. You will see how attach and registration work, how IMS APN and QCI5 activation are done, and how UE and EPC capabilities can be checked from logs. A clear step-by-step view of VoLTE call setup and signaling. #VoLTE #4G